(11 Aug 2015, 2:52 pm)S813 FVK wrote 2837 has either been debranded and repainted or just debranded: https://www.flickr.com/photos/gne-bus-ph...301617179/
Looks like the former to me.
Yep full repaint and new branding to come, linked to the X4/X5 losing their Quorum brand and going MAX, indeed 7604 is away for refurb at the moment.
Also of note is that 4511 has returned to use at Redcar, and they're also still using 4501!